6 hours on weekdays unless something needs downloading (in which case it's 24/7). 16 hours on weekends, and all other times it's in S3 sleep. I reboot for updates and the like. Laptop runs for maybe 2-4 hours a day two to three times a week unless I'm gaming on 360, in which case it runs as my wiki/guide/map/spreadsheet. It lives in hibernate.

Can't sleep without the noise. Drove me nuts when the power was out one night.

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seriously i've gotten used to the white noise. it's only and hdds, everything else is pretty silent. that being said, even the bedroom htpc is through a divide to lessen noise in my room. also, there are some nights i need it totally silent, rare though.

heat/power i don't care as again those are not that bad to begin with.

I used to need the sound when I slept in the same room as my computer. I've gotten out of that habit. My tower was pretty loud when I was running a Phenom II 940 with two of these fans on a Thermaltake Frio.

150 CFM is very loud at 100%, but let me tell you no matter what speed that fan runs at, it moves a crap-ton of air. Running it at 40-60% of max isn't too bad, but 100% is like a jet taking off. Maybe I'll take a video of it switch from lowest to 100%.

Have no need for 24/7 operation and actively use it about 6 hours a day at the most. I do have an old XP machine that I have an SSD on. Since it can't support TRIM I do let it idle for garbage collection to work for about a half day once a week.

Depends, mostly around 14 hours a day with every day clean boot except if I run some crazy video algorithms, it can be several days up to two weeks. I sleep with my head next to my pc, so that's why I invested in some better cooling